The Magicshine PMJ-852B LED Diving Light with a high brightness CREE XP-G LED produces 400 lumens of bright white light in a compact, waterproof package. Diving light shell is precision machined from Aircraft Grade 6061-T6 aluminum alloy with a hard anodized finish. Double O Rings on the battery cap closure form a watertight seal good to 100 meters in depth. The PMJ-852B has four modes of operation: High, Medium and Low, and Strobe operated by a magnet ring switch. Switch can be rotated easily by thumb and forefinger while holding the light in one hand. A rubber protected tether includes a jam cleat for securing the light to your wrist. The PMJ-852B is powered by a single 26650 rechargeable lithium ion battery with a continuous run time of up to 3 hours at full power. Battery is recharged in an enclosed aluminum charging tube, clearly marked for polarity. The battery can be fully recharged in 3-3.5 hours with the included AC charger adapter.